d $(d)$ An interesting example of an internal coupling reaction is provided by the diazotisation of $o-$ diaminobenzene
Benzotriazole may be obtained preparatively ( $75$ $\%$ yield) in this way.
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Assertion : Nitration of aniline can be conveniently done by protecting the amino group by acetylation.
Reason : Acetylation increases the electrondensity in the benzene ring